EPR Study of Water Induced Decomposition of the SrCuO_2 and Sr_2CuO_3 Ceramics Surface. The Role of Carbon Dioxide

• Authors: M. Augustyniak-Jabłokow , Yu. Yablokov , I. Jacyna-Onyszkiewicz , T. Ivanova , V. Shustov
• Languages of publication: EN

Abstracts

EN

Processes of SrCuO_2 and Sr_2CuO_3 ceramics decomposition induced by contact with water and carbon dioxide were studied by EPR. The dominant signals in the spectra were found to originate from Sr_2Cu(OH)_6 (for Sr_2CuO_3) and SrCu(OH)_4·H_2O (for SrCuO_2) compounds. The thermally induced conversion of SrCu(OH)_4·H_2O into Sr_2Cu(OH)_6 was analysed, and its product CuO was found to exist in the nanocrystalline form. The presence of CO_2, reacting with Sr(OH)_2, was shown to modify the decomposition process leading to the appearance of SrCu(OH)_4·H_2O, some hydroxycarbonates and Cu(OH)_2 on the surface of ceramics studied. At temperatures higher than 300ºC CuO reacts back with Sr(OH)_2. For the samples being in contact with atmospheric moisture this compound, deposited on a surface of SrCuO_2, decomposes to Sr_2Cu(OH)_6. The presence of the antiferromagnetic compounds Cu(OH)_2, CuO, and Cu_2[(OH)_2CO_3] in the samples can influence the results of magnetic measurements of the studied ceramics.

Keywords

EN

75.50.Ee; 76.30.Fc; 81.05.Je

Discipline

• 81.05.Je: Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)(for ceramics in electrochemistry, see 82.45.Yz)
• 76.30.Fc: Iron group (3d) ions and impurities (Ti-Cu)
• 75.50.Ee: Antiferromagnetics

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: 3
• Pages: 525-536

Dates

published

2007-09

received

2007-07-06

Contributors

author

M. Augustyniak-Jabłokow

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

Yu. Yablokov

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

I. Jacyna-Onyszkiewicz

• Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

T. Ivanova

• Kazan Physical Technical Institute RAS, Sibirskii trakt 10/7, 420 029 Kazan, Russia

author

V. Shustov

• Kazan Physical Technical Institute RAS, Sibirskii trakt 10/7, 420 029 Kazan, Russia

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Identifiers

DOI

10.12693/APhysPolA.112.525